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Investments in Associates - Summary of Cash Flows (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Net increase in cash and cash equivalents R$ 2,019,747 R$ 4,820,036 R$ 4,607,769
Effect of exchange rate fluctuations on cash held 511,465 350,608 242,707
Cash and cash equivalents at beginning of year 13,642,918 8,472,274 3,621,798
Cash and cash equivalents at end of year 16,174,130 13,642,918 8,472,274
Compass Gás e Energia [member]      
Disclosure of subsidiaries [line items]      
Net cash (used in) from operating activities (44,974) (18,046)
Net cash from (used in) investing activities (26,764) 776,872
Net cash (used in) from financing activities 1,265,679 (525,030)
Net increase in cash and cash equivalents 1,193,941 233,796
Effect of exchange rate fluctuations on cash held (13,898) (982)
Cash and cash equivalents at beginning of year 232,819 5 5
Cash and cash equivalents at end of year 1,412,862 232,819 5
Comgas [member]      
Disclosure of subsidiaries [line items]      
Net cash (used in) from operating activities 2,539,222 2,111,551 2,512,303
Net cash from (used in) investing activities (1,025,104) (1,768,298) 202,037
Net cash (used in) from financing activities (2,202,275) 198,890 (2,233,548)
Net increase in cash and cash equivalents (688,157) 542,143 480,792
Effect of exchange rate fluctuations on cash held (30,741) (15,005)
Cash and cash equivalents at beginning of year 1,610,548 1,083,410 602,618
Cash and cash equivalents at end of year 891,650 1,610,548 1,083,410
CLI [Member]      
Disclosure of subsidiaries [line items]      
Net cash (used in) from operating activities 95,461 71,654 82,946
Net cash from (used in) investing activities 77,742 (38,910) (10,140)
Net cash (used in) from financing activities (13,766) 14,874 291,898
Net increase in cash and cash equivalents 159,437 47,618 364,704
Effect of exchange rate fluctuations on cash held 109,642 125,268 (44,971)
Cash and cash equivalents at beginning of year 492,619 319,733
Cash and cash equivalents at end of year 761,698 492,619 319,733
Rumo S.A. [member]      
Disclosure of subsidiaries [line items]      
Net cash (used in) from operating activities (15,679) 463,170 197,313
Net cash from (used in) investing activities (1,469,750) (6,632,353) (929,861)
Net cash (used in) from financing activities 714,115 7,037,144 1,432,659
Net increase in cash and cash equivalents (771,314) 867,961 700,111
Effect of exchange rate fluctuations on cash held (5,551)
Cash and cash equivalents at beginning of year 1,568,667 700,706 595
Cash and cash equivalents at end of year 791,802 1,568,667 700,706
Cosan Investimentos [member]      
Disclosure of subsidiaries [line items]      
Net cash (used in) from operating activities 21,690
Net cash from (used in) investing activities 49,227
Net cash (used in) from financing activities (15,650)
Net increase in cash and cash equivalents 55,267
Effect of exchange rate fluctuations on cash held
Cash and cash equivalents at beginning of year
Cash and cash equivalents at end of year R$ 55,267